Having contacted the local stealer who wanted £3K!!!! for a new unit, and various other internet offerings in the £1500-£2000 range it was a choice between another second hand unit (which may end up having the same fault anyway) or see if he is still in business.
I couldnt find anywhere in the UK that offered the kit so found the guy via his website in Australia(Rangeroversolutions - note I have no connection to him and am not endorsing his products in anyway), he very responsive to email and kit is still available but now $155 aus via paypal including shipping .... so £45 for secondhand unit + £106 for the kit, some enjoyment in refurbing rather than just throw away .... sounds like a bargain, and from the feedback from you guys, sounds as if its works.
If anyone is interested in how this pans out let me know and I will update.
Cheers
M